Matrix indexing using a vector
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Let's say I have a vector b where each row correspond to an index for each row in the matrix A. I want to assign 1 to these elements, like in the matrix C, without loops. Thank you
A = zeros(4,3);
b = [2;1;2;3];
C = [0 1 0; 1 0 0; 0 1 0; 0 0 1]
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